Theorem 2.1 ([1]})  For a frame \(\xi \)  of a point of UGM \(\tau (x;\xi )\)  is a solution of the KP-hierarchy. Conversely for any formal power series solution \(\tau (x)\)  of the KP-hierarchy there exists a unique point \(U\)  of \({\rm UGM}\)  and a frame \(\xi \)  of \(U\)  such that \(\tau (x)=\tau (x;\xi )\) .

